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// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ppc64 || ppc64le
#include "textflag.h"
// For more details about how various memory models are
// enforced on POWER, the following paper provides more
// details about how they enforce C/C++ like models. This
// gives context about why the strange looking code
// sequences below work.
//
// http://www.rdrop.com/users/paulmck/scalability/paper/N2745r.2011.03.04a.html
// uint32 路Load(uint32 volatile* ptr)
TEXT 路Load(SB),NOSPLIT|NOFRAME,$-8-12
MOVD ptr+0(FP), R3
SYNC
MOVWZ 0(R3), R3
CMPW R3, R3, CR7
BC 4, 30, 1(PC) // bne- cr7,0x4
ISYNC
MOVW R3, ret+8(FP)
RET
// uint8 路Load8(uint8 volatile* ptr)
TEXT 路Load8(SB),NOSPLIT|NOFRAME,$-8-9
MOVD ptr+0(FP), R3
SYNC
MOVBZ 0(R3), R3
CMP R3, R3, CR7
BC 4, 30, 1(PC) // bne- cr7,0x4
ISYNC
MOVB R3, ret+8(FP)
RET
// uint64 路Load64(uint64 volatile* ptr)
TEXT 路Load64(SB),NOSPLIT|NOFRAME,$-8-16
MOVD ptr+0(FP), R3
SYNC
MOVD 0(R3), R3
CMP R3, R3, CR7
BC 4, 30, 1(PC) // bne- cr7,0x4
ISYNC
MOVD R3, ret+8(FP)
RET
// void *路Loadp(void *volatile *ptr)
TEXT 路Loadp(SB),NOSPLIT|NOFRAME,$-8-16
MOVD ptr+0(FP), R3
SYNC
MOVD 0(R3), R3
CMP R3, R3, CR7
BC 4, 30, 1(PC) // bne- cr7,0x4
ISYNC
MOVD R3, ret+8(FP)
RET
// uint32 路LoadAcq(uint32 volatile* ptr)
TEXT 路LoadAcq(SB),NOSPLIT|NOFRAME,$-8-12
MOVD ptr+0(FP), R3
MOVWZ 0(R3), R3
CMPW R3, R3, CR7
BC 4, 30, 1(PC) // bne- cr7, 0x4
ISYNC
MOVW R3, ret+8(FP)
RET
// uint64 路LoadAcq64(uint64 volatile* ptr)
TEXT 路LoadAcq64(SB),NOSPLIT|NOFRAME,$-8-16
MOVD ptr+0(FP), R3
MOVD 0(R3), R3
CMP R3, R3, CR7
BC 4, 30, 1(PC) // bne- cr7, 0x4
ISYNC
MOVD R3, ret+8(FP)
RET
// func Cas(ptr *int32, old, new int32) bool
// Atomically:
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT 路Cas(SB), NOSPLIT, $0-17
MOVD ptr+0(FP), R3
MOVWZ old+8(FP), R4
MOVWZ new+12(FP), R5
LWSYNC
cas_again:
LWAR (R3), R6
CMPW R6, R4
BNE cas_fail
STWCCC R5, (R3)
BNE cas_again
MOVD $1, R3
LWSYNC
MOVB R3, ret+16(FP)
RET
cas_fail:
LWSYNC
MOVB R0, ret+16(FP)
RET
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT 路Cas64(SB), NOSPLIT, $0-25
MOVD ptr+0(FP), R3
MOVD old+8(FP), R4
MOVD new+16(FP), R5
LWSYNC
cas64_again:
LDAR (R3), R6
CMP R6, R4
BNE cas64_fail
STDCCC R5, (R3)
BNE cas64_again
MOVD $1, R3
LWSYNC
MOVB R3, ret+24(FP)
RET
cas64_fail:
LWSYNC
MOVB R0, ret+24(FP)
RET
TEXT 路CasRel(SB), NOSPLIT, $0-17
MOVD ptr+0(FP), R3
MOVWZ old+8(FP), R4
MOVWZ new+12(FP), R5
LWSYNC
cas_again:
LWAR (R3), $0, R6 // 0 = Mutex release hint
CMPW R6, R4
BNE cas_fail
STWCCC R5, (R3)
BNE cas_again
MOVD $1, R3
MOVB R3, ret+16(FP)
RET
cas_fail:
MOVB R0, ret+16(FP)
RET
TEXT 路Casint32(SB), NOSPLIT, $0-17
BR 路Cas(SB)
TEXT 路Casint64(SB), NOSPLIT, $0-25
BR 路Cas64(SB)
TEXT 路Casuintptr(SB), NOSPLIT, $0-25
BR 路Cas64(SB)
TEXT 路Loaduintptr(SB), NOSPLIT|NOFRAME, $0-16
BR 路Load64(SB)
TEXT 路LoadAcquintptr(SB), NOSPLIT|NOFRAME, $0-16
BR 路LoadAcq64(SB)
TEXT 路Loaduint(SB), NOSPLIT|NOFRAME, $0-16
BR 路Load64(SB)
TEXT 路Storeint32(SB), NOSPLIT, $0-12
BR 路Store(SB)
TEXT 路Storeint64(SB), NOSPLIT, $0-16
BR 路Store64(SB)
TEXT 路Storeuintptr(SB), NOSPLIT, $0-16
BR 路Store64(SB)
TEXT 路StoreReluintptr(SB), NOSPLIT, $0-16
BR 路StoreRel64(SB)
TEXT 路Xadduintptr(SB), NOSPLIT, $0-24
BR 路Xadd64(SB)
TEXT 路Loadint32(SB), NOSPLIT, $0-12
BR 路Load(SB)
TEXT 路Loadint64(SB), NOSPLIT, $0-16
BR 路Load64(SB)
TEXT 路Xaddint32(SB), NOSPLIT, $0-20
BR 路Xadd(SB)
TEXT 路Xaddint64(SB), NOSPLIT, $0-24
BR 路Xadd64(SB)
// func Casp1(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool
// Atomically:
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT 路Casp1(SB), NOSPLIT, $0-25
BR 路Cas64(SB)
// uint32 xadd(uint32 volatile *ptr, int32 delta)
// Atomically:
// *val += delta;
// return *val;
TEXT 路Xadd(SB), NOSPLIT, $0-20
MOVD ptr+0(FP), R4
MOVW delta+8(FP), R5
LWSYNC
LWAR (R4), R3
ADD R5, R3
STWCCC R3, (R4)
BNE -3(PC)
MOVW R3, ret+16(FP)
RET
// uint64 Xadd64(uint64 volatile *val, int64 delta)
// Atomically:
// *val += delta;
// return *val;
TEXT 路Xadd64(SB), NOSPLIT, $0-24
MOVD ptr+0(FP), R4
MOVD delta+8(FP), R5
LWSYNC
LDAR (R4), R3
ADD R5, R3
STDCCC R3, (R4)
BNE -3(PC)
MOVD R3, ret+16(FP)
RET
// uint8 Xchg(ptr *uint8, new uint8)
// Atomically:
// old := *ptr;
// *ptr = new;
// return old;
TEXT 路Xchg8(SB), NOSPLIT, $0-17
MOVD ptr+0(FP), R4
MOVB new+8(FP), R5
LWSYNC
LBAR (R4), R3
STBCCC R5, (R4)
BNE -2(PC)
ISYNC
MOVB R3, ret+16(FP)
RET
// uint32 Xchg(ptr *uint32, new uint32)
// Atomically:
// old := *ptr;
// *ptr = new;
// return old;
TEXT 路Xchg(SB), NOSPLIT, $0-20
MOVD ptr+0(FP), R4
MOVW new+8(FP), R5
LWSYNC
LWAR (R4), R3
STWCCC R5, (R4)
BNE -2(PC)
ISYNC
MOVW R3, ret+16(FP)
RET
// uint64 Xchg64(ptr *uint64, new uint64)
// Atomically:
// old := *ptr;
// *ptr = new;
// return old;
TEXT 路Xchg64(SB), NOSPLIT, $0-24
MOVD ptr+0(FP), R4
MOVD new+8(FP), R5
LWSYNC
LDAR (R4), R3
STDCCC R5, (R4)
BNE -2(PC)
ISYNC
MOVD R3, ret+16(FP)
RET
TEXT 路Xchgint32(SB), NOSPLIT, $0-20
BR 路Xchg(SB)
TEXT 路Xchgint64(SB), NOSPLIT, $0-24
BR 路Xchg64(SB)
TEXT 路Xchguintptr(SB), NOSPLIT, $0-24
BR 路Xchg64(SB)
TEXT 路StorepNoWB(SB), NOSPLIT, $0-16
BR 路Store64(SB)
TEXT 路Store(SB), NOSPLIT, $0-12
MOVD ptr+0(FP), R3
MOVW val+8(FP), R4
SYNC
MOVW R4, 0(R3)
RET
TEXT 路Store8(SB), NOSPLIT, $0-9
MOVD ptr+0(FP), R3
MOVB val+8(FP), R4
SYNC
MOVB R4, 0(R3)
RET
TEXT 路Store64(SB), NOSPLIT, $0-16
MOVD ptr+0(FP), R3
MOVD val+8(FP), R4
SYNC
MOVD R4, 0(R3)
RET
TEXT 路StoreRel(SB), NOSPLIT, $0-12
MOVD ptr+0(FP), R3
MOVW val+8(FP), R4
LWSYNC
MOVW R4, 0(R3)
RET
TEXT 路StoreRel64(SB), NOSPLIT, $0-16
MOVD ptr+0(FP), R3
MOVD val+8(FP), R4
LWSYNC
MOVD R4, 0(R3)
RET
// void 路Or8(byte volatile*, byte);
TEXT 路Or8(SB), NOSPLIT, $0-9
MOVD ptr+0(FP), R3
MOVBZ val+8(FP), R4
LWSYNC
again:
LBAR (R3), R6
OR R4, R6
STBCCC R6, (R3)
BNE again
RET
// void 路And8(byte volatile*, byte);
TEXT 路And8(SB), NOSPLIT, $0-9
MOVD ptr+0(FP), R3
MOVBZ val+8(FP), R4
LWSYNC
again:
LBAR (R3), R6
AND R4, R6
STBCCC R6, (R3)
BNE again
RET
// func Or(addr *uint32, v uint32)
TEXT 路Or(SB), NOSPLIT, $0-12
MOVD ptr+0(FP), R3
MOVW val+8(FP), R4
LWSYNC
again:
LWAR (R3), R6
OR R4, R6
STWCCC R6, (R3)
BNE again
RET
// func And(addr *uint32, v uint32)
TEXT 路And(SB), NOSPLIT, $0-12
MOVD ptr+0(FP), R3
MOVW val+8(FP), R4
LWSYNC
again:
LWAR (R3),R6
AND R4, R6
STWCCC R6, (R3)
BNE again
RET
// func Or32(addr *uint32, v uint32) old uint32
TEXT 路Or32(SB), NOSPLIT, $0-20
MOVD ptr+0(FP), R3
MOVW val+8(FP), R4
LWSYNC
again:
LWAR (R3), R6
OR R4, R6, R7
STWCCC R7, (R3)
BNE again
MOVW R6, ret+16(FP)
RET
// func And32(addr *uint32, v uint32) old uint32
TEXT 路And32(SB), NOSPLIT, $0-20
MOVD ptr+0(FP), R3
MOVW val+8(FP), R4
LWSYNC
again:
LWAR (R3),R6
AND R4, R6, R7
STWCCC R7, (R3)
BNE again
MOVW R6, ret+16(FP)
RET
// func Or64(addr *uint64, v uint64) old uint64
TEXT 路Or64(SB), NOSPLIT, $0-24
MOVD ptr+0(FP), R3
MOVD val+8(FP), R4
LWSYNC
again:
LDAR (R3), R6
OR R4, R6, R7
STDCCC R7, (R3)
BNE again
MOVD R6, ret+16(FP)
RET
// func And64(addr *uint64, v uint64) old uint64
TEXT 路And64(SB), NOSPLIT, $0-24
MOVD ptr+0(FP), R3
MOVD val+8(FP), R4
LWSYNC
again:
LDAR (R3),R6
AND R4, R6, R7
STDCCC R7, (R3)
BNE again
MOVD R6, ret+16(FP)
RET
// func Anduintptr(addr *uintptr, v uintptr) old uintptr
TEXT 路Anduintptr(SB), NOSPLIT, $0-24
JMP 路And64(SB)
// func Oruintptr(addr *uintptr, v uintptr) old uintptr
TEXT 路Oruintptr(SB), NOSPLIT, $0-24
JMP 路Or64(SB)
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